brake light problems

gjd99tahoe · 08-24-2009, 06:17 PM

I have a 1996 gmc sierra 1/2 ton 350 and my brake lights just recently stop working. Have checked all bulbs ,fuses,wiring and even changed the switch on the peddle. When you push the peddle to stop the lights flash and go off.

stumpuller454 · 08-24-2009, 06:45 PM

sounds like a broken wire possibly, if its dark out have someone run the pedal and look for glowing wires

BernieB · 08-24-2009, 07:19 PM

If you have a trailer connector on the truck see if you're getting power there when the brake lights should be on. If you are then I'd suspect a bad ground on the lights. If not, or if it does the same thing, I'd suspect a broken wire as Stumpy says. Probably close to the connection to the brake pedal switch.

scavanger · 08-24-2009, 07:35 PM

Flash and then go off makes me think ground.

Scav.

crabtruck · 08-25-2009, 03:42 AM

Welcome to the forum gjd99tahoe.
If your third brake light works normal, could be bad stalk switch.
If third light also bad, TCC switch (brake pedal).
Haz's work ok right?

gjd99tahoe · 08-25-2009, 04:48 PM

thanks guys for the help. I've tried the ground and its ok. Don't have a trailor connect. And the third brake light doesn't come on either. The hazards work and when you turn on headlights they are on.

BernieB · 08-25-2009, 05:37 PM

Quote:

Originally Posted by gjd99tahoe

thanks guys for the help. I've tried the ground and its ok. Don't have a trailor connect. And the third brake light doesn't come on either. The hazards work and when you turn on headlights they are on.

The hazards come on with the headlights?

crabtruck · 08-25-2009, 06:17 PM

Try pulling the relay for third light if you have one (I believe so)
relay I mean, I got that you have a light.

It sounds like an overload but not a short, so maybe relay.
If no relay, diconnect wire near pedal that goes to third light,
but not where it is shared to stalk (column).

If this does not get it then the problem is stalk related.

That's based on haz works fine all four corners,
all three stops wink on and then stay off.
Wires after the stalk are common for haz and stop,
so not the issue imo.

08-24-2009, 06:17 PM	#1
gjd99tahoe Junior Member Join Date: May 2007 Posts: 4	brake light problems I have a 1996 gmc sierra 1/2 ton 350 and my brake lights just recently stop working. Have checked all bulbs ,fuses,wiring and even changed the switch on the peddle. When you push the peddle to stop the lights flash and go off.

08-24-2009, 06:45 PM	#2
stumpuller454 Senior Member Join Date: Dec 2007 Location: Grande Prairie, AB Posts: 2,043	sounds like a broken wire possibly, if its dark out have someone run the pedal and look for glowing wires __________________ SUPERCHARGED 454 K2500 GMC! 450hp and 600ft/lbs http://www.youtube.com/watch?v=WJ27RJHfJKE "sailing with Captain Morgan often!"

08-24-2009, 07:19 PM	#3
BernieB Senior Member Join Date: Jul 2009 Location: Fredericksburg, VA Posts: 1,910	If you have a trailer connector on the truck see if you're getting power there when the brake lights should be on. If you are then I'd suspect a bad ground on the lights. If not, or if it does the same thing, I'd suspect a broken wire as Stumpy says. Probably close to the connection to the brake pedal switch. __________________ If the guys who design 'em had to take one home, use it every day for 2 years, and do all the maint and repairs themselves, cars would have a button on the dash to change the oil, filters & plugs.

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08-24-2009, 07:35 PM	#4
scavanger Senior Member Join Date: May 2007 Posts: 262	Flash and then go off makes me think ground. Scav.

08-25-2009, 03:42 AM	#5
crabtruck Senior Member Join Date: Jul 2007 Location: on your 9 Posts: 3,366	Welcome to the forum gjd99tahoe. If your third brake light works normal, could be bad stalk switch. If third light also bad, TCC switch (brake pedal). Haz's work ok right?

08-25-2009, 04:48 PM	#6
gjd99tahoe Junior Member Join Date: May 2007 Posts: 4	thanks guys for the help. I've tried the ground and its ok. Don't have a trailor connect. And the third brake light doesn't come on either. The hazards work and when you turn on headlights they are on.

08-25-2009, 06:17 PM	#8
crabtruck Senior Member Join Date: Jul 2007 Location: on your 9 Posts: 3,366	Try pulling the relay for third light if you have one (I believe so) relay I mean, I got that you have a light. It sounds like an overload but not a short, so maybe relay. If no relay, diconnect wire near pedal that goes to third light, but not where it is shared to stalk (column). If this does not get it then the problem is stalk related. That's based on haz works fine all four corners, all three stops wink on and then stay off. Wires after the stalk are common for haz and stop, so not the issue imo.